The Stud,turnlock Fastener, cataloged under National Stock Number 5325-01-406-2138, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-406-2138 |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Status | ACTIVE |
| Drive Type | SOCKET |
| Turnlock Stud Shank Style | STUD SHANK |
| Material Document and Classification | AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE STUD |
| Material Document and Classification | AMS5643 ASSN STD SINGLE MATERIAL RESPONSE INSERT |
| Material Document and Classification | QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE CAP |
| Diameter | 0.750 INCHES NOMINAL IN |
| Stud Head Height | 0.0898 INCHES MINIMUM AND 0.0902 INCHES MAXIMUM IN |
| Turnlock Stud Head Style | FLAT FILLISTER |
| Stud Shank Major Diameter | 0.6257 INCHES MINIMUM AND 0.6261 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL CORROSION RESISTING CAP |
| Material | STEEL CORROSION RESISTING EJECTOR SPRING |
| Material | IRON ALLOY 660 STUD |
| Material | STEEL COMP 630 INSERT |
| Stud Thread Size and Series/type Designator | 0.164-32 UNJC |
| Grip Length | 0.800 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 8655499-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5325-01-406-2138 is a Stud,turnlock Fastener, classified under FSC 5325, Fastening Devices. Status: active.
Key specifications for 5325-01-406-2138: Drive Type: SOCKET; Turnlock Stud Shank Style: STUD SHANK; Material Document and Classification: AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE STUD; Material Document and Classification: AMS5643 ASSN STD SINGLE MATERIAL RESPONSE INSERT. 16 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.